Driving mechanism for one revolution clutches



1952 F. B. KEALL 2,607,457

DRIVING MECHANISM FOR ONE REVOLUTION CLUTCHES Filed April 4, 1946 16lwveniar .FTQTZK By his fifzovmey 9M 15, MM

Patented Aug. 19, 1952 DRIVING MECHANISM FOR ONE REVOL'UTION CLUTCHESFrank Bycroft Keall, Leicester, Eng land, assignor to UnitedShoeMachinei-y Corporation, Flem ington, N. J., a corporation of NewJersey Application April 4, 1946, Serial No. 659,566

In Great Britain Aprilll, 1945 (iClaims. (o1. 192-26) This inventionrelates to driving mechanism and is herein illustrated as embodied in apress of the type disclosed in United States Letters Patent No. 921,503,granted on May 11, 1909, upon an application filed in the name of ArthurBates.

. Presses of the type referred; to commonly comprise anarm mounted upona vertical spindle for movement laterally over a cutting block and formovement heightwise of the cutting block in performing pressure applyingoperations upon dies positioned upon material located upon the block forproducing blanks from the material. The spindle of such a machine isoperated from a drive shaft arranged to be connected to a flywheel by aone-revolution clutch. It is an object of the present invention toprovide improved driving mechanism for machines of this type which,while effective to drive the shaft positively thus to insure completelycutting through sheet material upon the action of the arm upon a die,will be capable of starting the shaft from rest without undue shock ornoise.

To this end and as shown, thereis provided a press having a drive shaftand a flywheel to-v gether with a yieldable block -associatedwith theflywheel and arranged to be movable with the accompanying drawings andare pointed out in,

the claims. v

In the drawing, the figure is an end view, partly in section,.of aportion of the flywheel and clutch mechanism of a press illustrating oneembodiment of the invention. v

By way of example the drawing illustrates the invention as applied toclutch mechanism for use in machines of the press type such as thatdisclosed in the aforementioned United States Letters Patent. s

The mechanism shown comprises a drive shaft I2 having a hub I4 and aflywheel l6 which is arranged to drive the shaft through mechanismhereinafter described.

To this end, the hub has a recess l8 in which is positioned a clutchbolt.20 slidably mounted for movement at right angles to a radius of theshaft. The clutch bolt is normally forced outmay by a sprin s: an d iscondoned by a trip ping mechanism, not shown in detail, and including acam 24. Any suitable tripping mechanism may be employed, the onlyrequirements being that there be provision for moving the cam into thedotted line position shown for the purpose of engaging the outerend ofthe bolt 20 to move it into inoperative position after a single I Inorder to drive the shaft at the proper time the flywheel is providedwith mechanism mov-' able into engagement with a face 26 on the bolt.This mechanism comprises a block 28 slidably mounted in a segmentalhousing 30 secured by bolts 3| to the flywheel. The block has a face 32,

arranged to engagethe face 26 of the bolt and circumferentially arrangedfaces 34 arranged slidably to engage the inner surface of a rim 36forming part of the housing and constituting a guide member fordirecting the block angularly about the axis of the flywheel. Movementof the block 28in a counterclockwise direction is limited by'engagementlof a flat surface 38 on arecessed portion of. the ,block' with a stop4!] projecting from the housing, of the flywheel.

The block 28 is normally pressed against a stop 4| on the'housing by atoggle comprising a heavy spring 42,0n end of which is seated in a bore44 in the block and the other end of which is supported bya shoulderedstem piece 46 having a reduced portion 48 resting upon a pin 50 mountedin 'a recess 52in a lever 54 which in turn is pivoted upon a stud'56 onthe flywheel. A light tension spring 58 connected'between a hook 60 onthe lever'54and a pin 62 on the flywheel limits outward movement of thelever 54 about its pivot 56.

Mounted upon the frame of the machine so as to be stationary withrespect to the flywheel I6 is a stud 64 carrying a roller 66 andslightly spaced therefrom is a cam plate 68 forming part of the frame.The lever 54 has an outer curved nose portion 10 arranged .to engage theroll 66 at the endofa revolution of the flywheel, with the result thatthe lever is rotated inwardly about its pivot 56, causing the spring toforce the block 28 against the stop 4l. The cam 68 isfshaped to permitgradual outward movement of the lever after it passes 'olf' the'roll 66,thus to reduce the pressure of the spring 42 upon the block so that thelatter is free to move toward the stop 46;

The drawing shows the mechanism with the parts in the position in whichthe bolt has just been released by the cam 24 and has been thrust by thespring 22 into the path of movement of the block 28 rotating, with theflywheel in .a clockwise.

direction, the face 32 of the block "having just contacted with the face26 of the bolt. The

shock of engagement of the moving block with l the bolt 29 is cushionedby the spring 42 which is compressed as the block moves relatively totheflywheel until the face 38 on the block contacts with the stop 40 on thehousing. During the along the cam plate 68, the spring 42 pushes thelever 54 gradually outwardly of the flywheel against the pull of thelight spring 58. The tendency of-the spring 42 to react suddenly,causing chatter between the block 28 and thebolt 2-0 is thus eliminatedand the driving force of the flywheel upon the bolt 20 will be continuedthrough the block 28 with the face-38 of the block and face 4'8 ofthehousing in contact, thus constituting a positive drive. At the end of arevolution of the flywheel and shaft, the bolt 20 will automatically bewithdrawn by operation of theta-m 24', and the lever 54 will have beenbrought around so that its curved end portion 'Hl'will againengagetheroller 66 andcause the lever tobepressed inwardly by the rollerinto the position shown in the drawing, the return of the variouspartsto' the positions shown being aided, by the spring 58;

it will be seen that themechanism above described will operate tofacilitate connection between a stationary shaft and a rotating flywheelwith' an initial yielding of parts followed-by a positive drive of theshaft bythe flywheel:

Having described my invention, what I claim asnewanddesire to secure byLetters Patent of the United States is:

' 1}. In a one revolution type driving mechanism, a;' drive shaft; ahubron the shaft, a flywheel-mounted coaxiall'y" of the shaft, a housingsecured: to the flywheel a'ndextending circumferenti'ally of the hub, ablock slidably mounted in the housing, aclutch part mounted in the hubandjm'ovable outwardly thereof into the path of movement of the block,the block" oppositely disposed faces;, a resilient means normallyoperative to force the block against one of thestops ina directiontoward the clutch part, and means" for releasing the resilient means toprovidefo'r the positive engagement of the block with the'cther stopafterthe" block has engaged the clutch-part.

2; In"a one revolution typ'e' driving mechanism, a drive shaft, a hub onthe shaft, a flywheel mounted coaxially of the shaft, a housing carriedby the flywheel andarranged circumferential ly ofthe' shaft, ablockslidably mounted in the housing, a clutch part slidably mountedihvthe' hubfor movement into the path of movement of the block, a, leverpivotallyl carried by the fl'y-' wheel; a spring extending from one end'ofthe lever into engagement with the block and'n'ormally operative toforce the block in a clockwise direction} means operable upon rotationof the flywheel to release the pressure of the spring, thereby toprovide for movement of the block in a counterclockwise directionrelative to the housing, and means associated with the flywheel forpositively arresting counterclockwise movement of the block. 7

3. In a one revolution type driving mechanism,

a drive shaft, a hub on the shaft, a flywheel mounted coaxially of theshaft, a plurality of spaced, stops carried by the flywheel, a blockslidably mounted upon the flywheel for move- 1 -=ment between the stops,a clutch part slidably mounted in the hub for movement into the path ofmovement of the block, a spring-pressed toggle pivotally mounted uponthe flywheel and having one end thereof connected to the block forforcing the block toward one of the stops, a cam for maintaining thetoggle in straightened condition during the initial-part of a cycle ofmovement'of the flywheeLand means for releasing the toggle, thereby toprovide for movement of the block into engagement with the'other stop;

4.- In a-one revolution type driving mechanism, a drive shaft, a hub onthe shaft, a flywheel mounted coaxially of the shaft, a plurality ofspacedstops carried by the flywheel, a block slidably mounted upon theflywheel for movement between the stops, a clutch part slidably mountedin the hub formovement into the path of movement of the block, resilientmeans normally op--- erative to force the block toward one of the stops,and means for relieving the resilient means subsequently to engagementof the block with the clutch part thus to providefor movement of theblock into positive engagement with the other ofthe stops.

a 5"; In aone revolution type driving mechanism,

a' drive shaft, a hub on the shaft, a flywheel I mounted coaxially ofthe shaft, a plurality of spaced's'tops'carried by the flywheel, a blockslidably mounted upon theflywheel for movement between the stops,aclutch part slidably mounted in the hub for movement into the path ofmovement of the block, resilient means normally operative to force theblock into engagement with one of the stops, cam-controlled means forreleasing the resilient means subsequently to engagement-of theblockwith the clutch part to provide for movement of the block intopositive engagement with the other of the stops, and meansfor renderingthe resilient means again operative after a single revolution of thedrive shaft.

6. In a one revolution type driving mechanism, a drive shaft; a hub onthe shaft, a flywheel mounted:coaxiallyofthe' shaft, a block slidably"mounted-on the flywheel'for angular movement about the axes of theflywheel and shaft, a clutch REFERENCES CITED The following referencesare of' record in I the file of this patent:

FOREIGN PATENTS Number Country Date- Australia Nov. 20, 1934

